PhonoVision PWM recording playback
Posted: Thu Feb 06, 2020 2:18 pm
I was recording as in Baird Style AM to the true PhonoVision Idea apart from it NBTV standard 32 line 12.5 frames a sec and has a Sync pulse..... today i swapped to Pulse width modulation recording and i seem to be getting much better results as far as recording Grey scale doing a better job and using the Bandwidth .
Got to do something about the platter speed spoils it might have another look at stepper motor here .
I would look into an oscillator feeding another high wattage amplifier to a transformer to the asynchronous Ac motor the frequency in theory should adjust the frequency ...but if i don't have the voltage i don't have the torque .
Results below end of disc so signal levels change at the end of the disc
youtu.be/hUpUE84MzpI
Got to do something about the platter speed spoils it might have another look at stepper motor here .
I would look into an oscillator feeding another high wattage amplifier to a transformer to the asynchronous Ac motor the frequency in theory should adjust the frequency ...but if i don't have the voltage i don't have the torque .
Results below end of disc so signal levels change at the end of the disc
youtu.be/hUpUE84MzpI